New, unopened product. In case of initial defects, please contact the Leader Media Techno Co., Ltd. support center listed on the back of the package for replacement or other support. These are neckband-type wireless earphones with Bluetooth 5.1+EDR, which significantly improves sound quality, playback time, and stability. They are IPx5 waterproof, so you can use them with confidence even in sudden rain during running. In addition, the shortest cord routing from a position close to the ear provides a comfortable fit, and magnets are installed in the left and right earphones to prevent tangling when not in use. They support hands-free calling and use canal-type earphones with high sound insulation. 【Product Details / Specifications】 Communication method: Bluetooth ver. 5.1 Built-in battery: 3.7V / 130mAh Playback frequency range: 20Hz～20KHz Charging time: Approximately 1.5～2 hours Talk/Maximum playback time: Approximately 12 hours Communication range: Approximately 8～30m (※Varies depending on the environment) Impedance: 16±10%Ω Sensitivity: 91dB±3dB Driver unit: 10mm Waterproof level: IPx5 Supported profiles: HFP A2DP AVRCP AVDTP GAP SDP Accessories: Ear tips S & L each 1 set (M size pre-installed), charging cable, instruction manual Brand name: Lazos Product model number: L-BTE-BK Black JAN code: 4571414154703 【Precautions for Use】 ● Use the included charging cable (5V/1A) to charge this product. Malfunctions with other cables are not covered by the warranty. ● Charge this product before use. ● Use hands-free calling in compliance with the ordinances of each prefecture. ● Connection operation with all Bluetooth-compatible devices is not guaranteed. It may not work depending on your Bluetooth-compatible product or the application you are using. ● Noise may occur due to magnetic fields, static electricity, or radio wave interference. ● The built-in battery will naturally discharge if not used for a long time. It will also be consumed by repeated charging and discharging. It cannot be replaced. ● We are not responsible for any damage, such as equipment failure or data loss, that occurs during the use of this product.